Insulation



F. R. LESLIE Dec. 12, 1933.

INSULATION Filed Aug. 2, 1929 INVENTOR Frank .R Leslie TORNEY Patented Dec. 12, 1933 UNITED STATES PATENT OFFICE INSULATION Frank R. Leslie, White Bear Lake, Minn. Application August 2, 1929. 'Serial no. 383,072 2 Claims. (Cl. 154-45) My invention relates to improvements in insulation, its object being to provide an insulation made up of a plurality of sheets of flexible material, as paper, so constructed as to hold the sheets thoroughly separated throughout their central portions when the material is installed, thesheets being in closely superposed relation at their edges so that they may be freely bent along their edges to enable the material to be fastened to side and overhead supports, as where the material is used in filling between timbering, or between the studdings.

I am aware that it is old to construct an insulation of a plurality of newspapers fastened together at their edges, but, with such constructions, separation of the sheets is only secured by having the sheets shifted at their ends, as there is no means carried by the sheets themselves for positively holding them separated. I am also aware that it is 'old to secure a plurality of corrugated sheets together. Such constructions are impracticable for the purpose for which my construction is intended. Such sheets can only be bent upon the lines of corrugation, as the lines of corrugation give a stiffness lengthwise of the sheet. As a matter of fact, sheets of this corrugated type are necessarily made of comparatively stiff construction and are ordinarily used flat, and, where not flat, only susceptible of a curved bending and not of a right angled bending, as is necessary where the material is, used between the studdings, where the material must be bent at sharp angles and fastened along the sides of the studding.

These and other features of the invention will be more specifically brought out in the following description and accompanying drawing, wherein:

Figure 1 is a plan view showing one sheet of my insulation, and

Figure 2 is an end view of the structure shown in Figure 1 showing one edge bent for fastening to an adjacent studding.

In carrying out my invention, I utilize a plurality of sheets, preferably of paper, .flexible enough to be easily bent, but still enough to be formed with projecting indentations.- Each sheet 2 is formedwith a plurality of separated projections 3, these projections being arranged in a scattered position throughout the central portion of the sheet, so that a bending of the sheet is possible at any point between the indentations. In order to permit the sheets being easily bent along a desired line, the sheets may be formed with a line of scoring 6 at the desired line ofbend. The projections 3 are of sufllcient projection and suffllciently close enough to hold the sheets uniformly separated throughout theircentral portions, as shown in Figure 2, with the projections of one sheet contacting with the flat portion of the next sheet. These sheets are left loose with respect to each other throughout their central portions and are secured together at their edges as by means of stitching 5.

It is recognized in the building art that material of the character of paper sheets constitutes a particularly good form of insulation, and such character of insulation has been employed in different ways, as, for instance, the stiff insulation made of corrugated paper and adapted for a flat form of insulaton, but not adapted for being placed between studdings and bent at a sharp angle to fasten to those studdings. Such corrugated paper has also been used for pipe coverings, where the corrugated paper has been used in curved layers, but in which there are no joint surfaces for the corrugations to contact with to hold the sheets uniformly separated, Newspapers have also been employed for building insulation, the papers being fastened together along their edges, but in using newspapers the superposed sheets only stand separated where the sheets are shifted at their ends to make one sheet bulge with reference to the next sheet. Where this is done, there is a bulge in the center, decreasing toward the sides, and, in addition to being an impracticable way of effectively stitching a large plurality of sheets together, does not give the uniform separation of sheets from side to side when in position, as attained by the present invention.

In my construction, by having a plurality of scattered projections upon the face of each sheet contacting with the flat portion of the next sheet, there is a positive separation of the sheets from stud to stud, and, except along the edges immediately adjacent to the studs, a substantially uniform separation of the sheets.

I have found that with my arrangement and construction of sheets a highly efliclent form of insulation is secured, particularly where the 1 0 sheets are secured between studdings where the studdings may not be uniformly separated and the sheets have to be bent at different distances from the edge thereof.

I claim: i

1. A composite insulationstructuracomprising a plurality of flexible sheets, each of said sheets being indented with a multiplicity of indentations throughout their centralarea, and being unindented along the edge portions thereno tions connected together throughout their length, and fold creases spaced inwardly from the edges of said sheets, said composite structure being adapted to have the edge portions outwardly from said creased edges bent at right angles to the central portion thereof, and said indentations holding said sheets positively spaced apart inwardly from said line of fold.

FRANK R. LESLIE. 

